# Sader Method vs Protractor Edge

The clearest difference is rating: Sader Method at 5.0 against Protractor Edge's 4.5. Sader Method also leads on in-app purchases (none vs 2) and ads (none vs shown). Protractor Edge's advantage is ratings volume (55 vs 1) and iOS requirement (9.0 vs 15.4). On price, update cadence and device support there is nothing between them.

Both are free to download. Protractor Edge sells 2 in-app purchases, starting at $1.99 per year. Sader Method asks for nothing beyond the download.

Sader Method holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Protractor Edge has 55 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Sader Method's written reviews are positive against 70% of Protractor Edge's.

Sader Method ships an update every 57 months, Protractor Edge every 43 months. The most recent releases landed on September 17, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Sader Method | Protractor Edge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sader-method/id402544930/reviews)** | [4.5 (55 ratings)](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762/reviews) |
| Number of ratings | 1 | **55** |
| Positive reviews | **100.0% of reviews** | 69.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 57 months | **Every 43 months** |
| Monetization | **Free** | Freemium |
| Size | 2 MB | 21 MB |
| Requires iOS | 15.4 | **9.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Sader](https://appshunter.io/developer/402544933) | [嵩 张](https://appshunter.io/developer/1091921941) |

## What reviewers say

### Sader Method

[App page](https://appshunter.io/ios/app/sader-method/id402544930)

This utility app helps calibrate Atomic Force Microscope cantilevers. It provides a user interface to determine the spring constant of a cantilever using its resonant frequency and quality factor.

**Highlights:** Atomic Force Microscope cantilever calibration, Determine spring constant, Resonant frequency measurement, Quality factor measurement, User interface for calibration

**Features:** macOS Compatibility

**In-app purchases:** none


### Protractor Edge

[App page](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762)

Measure angles directly on your device without taking photos or placing the angle on screen. This app offers a unique and efficient way to determine degrees, saving you time with its handy assistant functionality.

**Highlights:** Direct angle measurement on device, Intuitive line dragging interface, Measures angles in photos (Premium), Measures from camera view (Premium), Ad-free experience (Premium)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $1.99 | per year |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Sader Method free?

Sader Method is free to download, with no in-app purchases.

### Is Protractor Edge free?

Protractor Edge is free to download, with in-app purchases available.

### Which has better reviews, Sader Method or Protractor Edge?

Sader Method is rated higher. Sader Method averages 5.0 out of 5 from 1 ratings, while Protractor Edge averages 4.5 from 55 ratings.

### Do Sader Method or Protractor Edge have ads?

Protractor Edge shows ads; Sader Method does not.

### Which is updated more often, Sader Method or Protractor Edge?

Sader Method ships an update every 57 months, and Protractor Edge every 43 months. Most recently, Sader Method was updated on September 17, 2026 and Protractor Edge on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*